Tool



May 23 1939- L. E. wARNocK 2,159,918

TOOL- Filed June 13, 1938 BY mfg/ww ATTORN EYS Patented May 23, 1939 UNI-TED STATES PATENT OFFICE TOOL Leonard E. Warnock, Towns, Ga.

Application June 13, 1938, Serial No. 213,536

4 Claims.

' This invention relates to tools and has for an object to provide a tool adapted for use to lap cylinders suchas the master cylinders of hydraulic brake systems.

A further object is to provide a tool of this character having parallel fingers adapted to receive a sheet of emerypaper through the medium of' which the cylindrical metal surface of the cylinder is lapped when the tool is rotated on its axis inthe cylinder.

A further object is to provide a tool of this character which is easily adjusted to operate in connection with cylinders of various diameters.

Av further object isV to provide a tool of this character which may beformed of a few strong simple and durable parts, which will be inexpensive to manufacture and which will not easily get out. of order.

With the above and other objects in View the invention consists of certain novel details of construction and combinations of parts hereinafter fullydeseribed'and claimed, it being un` derstood that various modifications may be resorted to within the scope of the appended claims Without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawing forming part of this specification:

Figure l is a longitudinal sectional View through a cylinder and showing the application oi a tool constructed in accordance with the invention thereto.

Figure 2 is a side elevation of the tool showing the use of a spring to space the free ends of the emery paper holding ngers apart.

Figure 3 is a fragmentary end elevation of the tool.

Figure 4 is a crossI sectional view taken on the line 4 4 of Figure 2 and showing the graduations through the medium of which the fingers may be set a predetermined distance apart.

Figure 5 is a cross sectional view taken on the line 5 5 of Figure 2 and showing the adjusting bolt in elevation.

Figure 6 is a cross sectional view taken on the line 6-6 of Figure l and drawn to a large scale.

Figure '7 is a side elevation of an adjusting screw which may be substituted for the spring to hold the fingers spaced apart in cylinders open at both ends.

Figure 8 is a side elevation of an adjusting pin which may be used to hold the ngers spaced apart in cylinders open at one end.

Referring now to the drawing in which like characters of reference designate similar parts in the various views, I Il'designates a shank Which terminates at one end in a transversely disposed head or bar II having a web I2 extending lon- I'5l gitudinally of the bar and spaced midway between the sides of the bar. I

A pair of rods or fingers I-3 are adjustably mountedon the cross bar I I and for this purpose one end I4 of each finger is directed to extend 110 at a right angle to the linger. The laterally directed end of the linger is provided with a 1ongitudinal slot I5.

The laterally directed ends of the lingers extend along respective sides of the web I2, as best T5 shown in Figure 3. An adjusting bolt I6 is passed through the slots I5 of the fingers and through an opening Il in the web I 2, as best shown in Figure 5. The bolt is equipped with a wing nut I8 which may be tightened after the ngers are 20 set any desiredV distance apart to lockv the fingers adjusted position.A

Asbest shown in Figure 1 an adjusting screw I9 having a right and left thread and provided centrally with a knurled nut 20, is engaged at 25 the ends in threaded openings 2l formed in the fingers near the tips thereof. By rotating the screw the free ends of the fingers may be held spaced apart.

'I'he knurled nut is received in recesses 22 30 formed in the inner sides of the ngers so that the fingers may be placed in contact with each other throughout the length of their inner sides to fit into small cylinders. A screw 23, best shown in Figure 1, of greater length than the 35 screw I9 may be used when it is desired to space the fingers to enter cylinders with openings at both ends. As shown in Figure 8 a pin 35 with helical springs 36 on opposed ends may be used to space the fingers to enter cylinders open at 40 one end.

A leaf spring having two legs 24 and a coil 25 may be substituted for the screw 23, there being notches 26 formed in the inner faces of the ngers to receive out-turned tips 2'I of the 45 spring. Longitudinal grooves 21' are formed in the inner sides of the fingers to receive the legs of the spring. 'I'he spring yieldably holds the ngers spaced a predetermined distance apart upon the adjusting bolt I6 being loosened to 50 effect a desired spacing of the fingers.

One of the lingers is provided with a longitudinal slot 28 which opens through the sides of the finger and is adapted to receive a longitudinal edge portion 29 of a sheet of emery paper, the 55 sheet being bent around the finger and directed therefrom and around the opposite finger as best shown in Figure 6.

The shank I0 of the tool is provided with a suitable terminal 30 to receive a chuck 3| of any desired rotating mechanism for rotating the tool with the emery paper therein in the bore of a cylinder 32. v

As best shown in Figure 4 the longitudinal edge of the web I2 is provided with graduations 33 forming two scales beginning at a common point at the center of the web and running in opposite directions to the ends of the web. The laterally directed ends I4 of the ngers are provided with marks 34 which coact with the graduations of the scales to assist the operator in adjusting the iingers to any desired distance apart.

In operation when the emery paper is applied to the tool as shown in Figure 6, and the tool rotated in the bore of the cylinder 32, the fingers press the emery paper at two diametrically opposite points against the inner face of the cylinder and eiectively lap or hone the cylinder.

From the above description it is thought that the construction and operation of the invention will be fully understood Without further explanation.

What is claimed is:

1. A tool for lapping cylinders comprising a shank, a head transversely disposed on the shank, a web projecting from the head, a pair of fingers each having an end directed at a right angle to the finger and disposed on the head at a respective side of said web, one of the fingers being longitudinally slotted to secure a sheet of emery paper thereto, the laterally directed ends of the fingers being provided with longitudinal slots, and an adjusting bolt carried by said Web and slidably Vengaged in said slots.

2. A tool for lapping cylinders comprising a shank, a head transversely disposed on the shank, a web projecting from Vthe head, a pair of ngers each having an end directed at a right angle to the linger and disposed on the head at a respective side of said web, one of the ngers being longitudinally slotted to secure a sheet of emery paper thereto, the laterally directed ends of the fingers being provided with longitudinal slots, an adjusting bolt carried by said web and slidably engaged in said slots, and means engaged between the free ends of the fingers for holding the fingers spaced a predetermined distance apart.

3. A tool for lapping cylinders comprising a shank, a head transversely disposed on the shank, a web projecting from the head, a pair of fingers each having an end directed at a right angle to the finger and disposed on the head at a respective side of said web, one of the fingers being longitudinally slotted to secure a sheet of emery paper thereto, the laterally directed ends of the fingers being provided with longitudinal slots, an adjusting bolt carried by said web and slidably engaged in said slots, and an adjusting screw having a right and left thread engaged in correspondingly threaded openings at the free ends of the fingers to hold the ngers spaced a predetermined distance apart. l

4. A tool for lapping cylinders comprising a shank, a head transversely disposed on the shank, a web projecting from the head, a pair of fingers each having an end directed at a right angle to the iinger and disposed on the head at a respective side of said web, one of the ngers being longitudinally slotted to secure a sheet of emery paper thereto, the laterally directed ends of the fingers being provided with longitudinal slots, an adjusting bolt carried by said web and slidably engaged in said slots, and a spring interposed between the ngers and having the ends engaged with the ngers to yieldably holdV the ngers spaced a predetermined distance apart upon the adjusting bolt being, loosened to eiect a desired spacing of the fingers.

LEONARD El. WARNOCK. 

